Perhaps you should try some spelling variations:
thanh phan » thanh pho, thanh san, thanh toan
cua triet » cua viet, va triet
su triet » su viet, su tien, ve triet
va thanh » gia thanh, ban thanh, va tinh
cac bac » cac bai, cac ban, cac cach
hieu ve » hieu va, hieu van
ky lang » ky dang, ky tang, tay lang
bac va » ban va, bac ha, bao va
ve cac » va cac, vien cac
su sac » su sach, su cac, su xac

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: su sac ((ky lang) or (ky nang)) xa hoi. hieu ve cac bac va thanh phan ((cua triet) OR (su triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sac ((ky lang) OR (ky nang)) xa hoi. hieu ve cac bac va thanh phan ((cua triet) OR (su triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sac ((ky lang) or (ky nang)) xa hoi. hieu ve cac bac va thanh phan ((cua triet) OR (su triet))".
• Adding a wildcard symbol may retrieve word variants: su sac ((ky lang) or (ky nang)) xa hoi. hieu ve cac bac va thanh phan ((cua triet) OR (su triet))*.